[meteorite-list] Ringwoodite

From: drtanuki <drtanuki_at_meteoritecentral.com>
Date: Wed, 21 Jan 2009 19:53:55 -0800 (PST)
Message-ID: <703833.10847.qm_at_web53204.mail.re2.yahoo.com>

Dear Pete, Elton and List,
 I have several kilos of individual stones of the Sahara 98222?? with Ringwoodite (haven`t confirmed the # - from my memory- will have to check). I purchased them from the Labennes about 8-9 years ago. They are an L chondrite. If you require more information I will locate it. Best, Dirk Ross...Tokyo


--- On Thu, 1/22/09, Mr EMan <mstreman53 at yahoo.com> wrote:

> From: Mr EMan <mstreman53 at yahoo.com>
> Subject: Re: [meteorite-list] Ringwoodite
> To: "Pete Pete" <rsvp321 at hotmail.com>, "metlist" <meteorite-list at meteoritecentral.com>
> Date: Thursday, January 22, 2009, 12:41 PM
> Hello Pete: Off the top of my head -- I don't recall
> ever hearing of "indigo" blue in a meteorite. I
> do know that ringwoodite is barely translucent with a pale
> purple-over-brown tint especially visible to the eye under a
> low power loupe. Perhaps it is just semantics.
>
> When the list last visited ringwoodite veins, I believe
> they were almost always found in L chondrites but this could
> have been from paired finds. I say this suggesting that the
> bulk of ringwoodite veins observed/sampled on earth might
> have come from the same disrupted parent body-- but have
> nothing other than vignette evidence to support it.
>
> I believe your discovery is about right regarding
> ringwoodite abundance. I have seen swellings of ringwoodite
> veins to about 3-5mm but 1mm is normal. Ringwoodite veins
> are likely injection veins along existing fractures/lines of
> weakness. The purity of the veins does not suggest the veins
> occur as flash melts.
>
> About 8 years ago there was a run of ringwoodite bearing
> slices being sold but I believe it came from a larger find
> of multiple stones--Sorry I don't have the NWA numbers.
>
> Please send a photo when /if you can.
>
> Elton
>
>
> --- On Wed, 1/21/09, Pete Pete <rsvp321 at hotmail.com>
> wrote:
>
> > From: Pete Pete <rsvp321 at hotmail.com>
> > Subject: [meteorite-list] Ringwoodite
> > To: "meteoritelist meteoritelist"
> <meteorite-list at meteoritecentral.com>
> > Date: Wednesday, January 21, 2009, 6:12 PM
> > Greetings, all,
> >
> >
> > In the experience of the chondrite-cutters, how common
> are
> > you finding ringwoodite in shock melt veins?
> >
> > Personally, I've only seen (what I believe to be)
> > ringwoodite in two stones out of the dozens I've
> cut.
> >
> > How about size? In mine, the largest area is ~ .5 mm.
> >
> > For such an outstanding indigo blue colour in a
> generally
> > brown matrix, I'm surprised there isn't that
> much
> > information about the mineral in meteorites on the
> internet
> > or my books.
> >
> > Cheers,
> > Pete
> >
>
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Received on Wed 21 Jan 2009 10:53:55 PM PST